HRH Charles's 10-Great Aunt. HM Juan Carlos' 11-Great Aunt. Philippe of Belgium's 11-Great Aunt. Grand Duke Henri's 11-Great Aunt. HM Margrethe II's 10-Great Aunt. HM Beatrix's 10-Great Aunt. HM Constantine II's 10-Great Grandmother. HM Carl XVI Gustaf's 10-Great Grandmother. HM Harald V's 10-Great Aunt. Ksr Wilhelm II's 8-Great Aunt.